File: drop_last_spec.rb

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require 'spec_helper'

unless Enumerable.method_defined? :drop_last
  describe 'Enumerable#drop_last' do
    it 'drops the last n elements' do
      expect([1, 2, 3, 4].drop_last(2)).to eq([1, 2])
    end

    it 'returns an empty array if you request to drop too many elems' do
      expect((1..10).drop_last(100)).to eq([])
    end

    it 'does not accept negative argument' do
      expect { [1, 2, 3, 4].drop_last(-1) }.to raise_error(ArgumentError)
    end
  end
end